tilman
49 lines
2.1 KiB
Python
49 lines
2.1 KiB
Python
#!/usr/bin/env python2.7
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# script by Alex Eames http://RasPi.tv
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# http://RasPi.tv/how-to-use-interrupts-with-python-on-the-raspberry-pi-and-rpi-gpio-part-3
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import RPi.GPIO as GPIO
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GPIO.setmode(GPIO.BCM)
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# GPIO 23 & 17 set up as inputs, pulled up to avoid false detection.
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# Both ports are wired to connect to GND on button press.
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# So we'll be setting up falling edge detection for both
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GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)
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GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
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# GPIO 24 set up as an input, pulled down, connected to 3V3 on button press
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GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
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# now we'll define two threaded callback functions
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# these will run in another thread when our events are detected
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def my_callback(channel):
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print "falling edge detected on 17"
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def my_callback2(channel):
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print "falling edge detected on 23"
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print "Make sure you have a button connected so that when pressed"
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print "it will connect GPIO port 23 (pin 16) to GND (pin 6)\n"
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print "You will also need a second button connected so that when pressed"
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print "it will connect GPIO port 24 (pin 18) to 3V3 (pin 1)\n"
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print "You will also need a third button connected so that when pressed"
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print "it will connect GPIO port 17 (pin 11) to GND (pin 14)"
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raw_input("Press Enter when ready\n>")
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# when a falling edge is detected on port 17, regardless of whatever
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# else is happening in the program, the function my_callback will be run
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GPIO.add_event_detect(17, GPIO.FALLING, callback=my_callback, bouncetime=300)
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# when a falling edge is detected on port 23, regardless of whatever
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# else is happening in the program, the function my_callback2 will be run
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# 'bouncetime=300' includes the bounce control written into interrupts2a.py
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GPIO.add_event_detect(23, GPIO.FALLING, callback=my_callback2, bouncetime=300)
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try:
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print "Waiting for rising edge on port 24"
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GPIO.wait_for_edge(24, GPIO.RISING)
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print "Rising edge detected on port 24. Here endeth the third lesson."
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except KeyboardInterrupt:
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GPIO.cleanup() # clean up GPIO on CTRL+C exit
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GPIO.cleanup() # clean up GPIO on normal exit
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